Experimental study of retrofitted reinforced concrete shear wall and concrete-encased steel girders using a new CarbonFlex composite for damage stabilization |
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| Affiliation: | 1. School of Sustainable Engineering and the Built Environment, Arizona State University, Tempe, AZ 85287, USA;2. College of Civil Engineering, Tongji University, Shanghai 200092, China;3. State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China;1. Department of Civil Engineering, University of Texas at Arlington, Box 19308, Arlington, TX 76019, United States;2. University of Texas at Arlington, Box 19308, Arlington, TX 76019, United States;3. Engineer-in-Training, 603 Causley Avenue, Apt 13, Arlington, TX 76010, United States;1. Department of Civil and Environmental Engineering, University of Alberta, Canada;2. 7-306 Donadeo Innovation Centre for Engineering, Department of Civil and Environmental Engineering, University of Alberta, Canada;1. Texas A&M Transportation Institute, Texas A&M Univ., College Station, TX 77843, United States;2. Department of Civil Engineering, Boğaziçi University, Istanbul 34342, Turkey;3. Department of Civil Engineering, University of Chile, Blanco Encalada 2002, Santiago, Chile |
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| Abstract: | A bi-axially loaded shear wall and two fatigue-damaged concrete-encased steel girders are experimentally tested using a retrofit technique that utilizes a newly developed composite wrap. The composite, which is being termed “CarbonFlex,” helps to stabilize the propagation of damage, specifically fracture, in retrofitted beams and a shear wall via an energy dissipation mechanism, resulting in significant ductility and confinement, and high-strength sustainability. The CarbonFlex-retrofitted shear wall had been initially damaged to a level corresponding to 40% of its peak strength under bi-axial loading (constant vertical load and quasi-static cyclic lateral load). Following the CarbonFlex-retrofit, the capacity doubled to 80% of its original strength while exhibiting significant ductility and having tremendously improved confinement. The fatigue-damaged beams are retrofitted using conventional carbon–fiber reinforced polymers (CFRPs), and then, separately, using the new prototype CarbonFlex composite. The latter beam sustained over 68% of its peak strength following dissipation of the initial shock energy of the fractured welds of the encased steel girder; the beam also exhibited significant displacement ductility, having an ultimate displacement three times that of its CFRP counterpart. |
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